Is this tank cycled?

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Probably not. It may be cycled because the ammonia test is that false .25, but normally in a cycled tank you'll have 0 ammonia and nitrites, and a number of nitrates(0 nitrates is possible though). If it is a fish in cycle, I would add fish more slowly. If its a fishless cycle, I would make sure the tank processes 2 ish ppm of ammonia in 24 hours. Can you send a picture of readings?
As others have said it will be best to research the nitrogen cycle and look into doing a fishless cycle.

You will also have to change what you’re planning to stock with as an angel and a pleco cannot fit in a 20gal.

If you would like we can throw up some better stocking options
 
A lot of fish stores are notorious for telling people to let it sit for a few days and cycle. This is not what the nitrogen cycle is. It takes a month sometimes longer to cycle depending if you do fish in or fishless.
 
As others have said it will be best to research the nitrogen cycle and look into doing a fishless cycle.

You will also have to change what you’re planning to stock with as an angel and a pleco cannot fit in a 20gal.

If you would like we can throw up some better stocking options
yes that would be great!
 
Is your tank 24" wide or 30" wide? There is a 6" difference in length between a long and tall. This will have somewhat of an impact on the fish you can have.
 
Not until you have 0 Ammonia, 0 Nitrite and 20 or under nitrate. I know waiting is hard but everyone will tell you that if you do this right, you'll avoid a lot of trouble down the road. What has been your method to cycle?

Do you have plants in your tank? Post a pic of your setup if you would.

What number and species of livestock will you be adding once it's cycled?
 
Not until you have 0 Ammonia, 0 Nitrite and 20 or under nitrate. I know waiting is hard but everyone will tell you that if you do this right, you'll avoid a lot of trouble down the road. What has been your method to cycle?

Do you have plants in your tank? Post a pic of your setup if you would.

What number and species of livestock will you be adding once it's cycled?
i have no plants and i want to add a school or 2
 
Probably not. It may be cycled because the ammonia test is that false .25, but normally in a cycled tank you'll have 0 ammonia and nitrites, and a number of nitrates(0 nitrates is possible though). If it is a fish in cycle, I would add fish more slowly. If its a fishless cycle, I would make sure the tank processes 2 ish ppm of ammonia in 24 hours. Can you send a picture of readings?
 
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